The OpenAjax Alliance is an organization of leading vendors, open
source projects, and companies using Ajax that are dedicated to the
successful adoption of open and interoperable Ajax-based Web technologies

Its a complete and very good framework, lot of examples and semi/ready
to use complete programs demo. It use a very compact code to render
the pages, with own tags param definitions. A pre-procesor render
the HTML result. But maybe it is heavy to understand for a novice,
it is very expensive too.